The evidence against the F/O looks overwhelming but based on a single memory card as far as I understand.
I think there are 3 sources to date:
- CVR
- ATC: Mode C/S and Comms (or lack of)
- ADS-B e.g. FR24
The last is somewhat "independent" in that it recorded in real time certain data - the most significant of which I would think are:
- Selected Altitude would down to ~100'
- Once past transition, I believe IAS is maintained accurately at just under 350KIAS (Max) - I am sure some maths will show whether or not M was consistent above Transition?
I would think if a "shootdown" or structural failure was responsible, the ADS-B data would be very different? Whilst we have heard little re the ATC Data, I suspect that would be as the ADS-B.